Synthesis of aromatic polyamide in vacuum.

Iijima, Masayuki; Takahashi, Yoshikazu; Inagawa, Konosuke; Itoh, Akio

doi:10.3131/jvsj.28.437

Cited by 42 publications

(22 citation statements)

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“…The properties of solution-cast poly͑4,4Ј-oxydiphenylenepyromellitimide͒ ͑PMDA-ODA polyimide͒ at nonambient temperatures have been reported: gas permeability at 323-523 K and mechanical properties at 4.2-473 K; 4,5 however, equivalent data are unavailable for vapor-deposited polyimide. In previous studies, PMDA-ODA polyimide microcapsules were developed based on vapor deposition polymerization, 6,7 and the roomtemperature properties were characterized. 2,3 This work presents the results of our continuing effort to extend the characterization of vapor-deposited polyimide to elevated and cryogenic temperatures.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the properties of vapor-deposited polyimide

Tsai

Blanton

Harding

et al. 2003

Journal of Applied Physics

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The Young's modulus and helium gas permeability of vapor-deposited poly͑4,4Ј-oxydiphenylenepyromellitimide͒ were measured at cryogenic and elevated temperatures ͑10-573 K͒. The Young's modulus decreased with increasing temperature from 5.5 GPa at 10 K to 1.8 GPa at 573 K. The temperature dependency of the permeability followed the Arrhenius' relationship, with different activation energy for permeation for samples imidized under different conditions. The effect of the imidization conditions on the permeation properties could be explained in terms of morphology/crystallinity as determined by x-ray diffraction techniques. Imidizing in air instead of nitrogen increased the permeability while lowering the activation energy for permeation and crystallinity. Imidizing at higher heating rates ͑in nitrogen͒ resulted in higher permeability, lower activation energy for permeation, and larger and fewer crystallites with better-aligned lattice planes.

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Section: Introductionmentioning

confidence: 99%

Temperature dependence of the properties of vapor-deposited polyimide

Tsai

Blanton

Harding

et al. 2003

Journal of Applied Physics

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“…11,12 An alternative to overcoming the aforementioned drawbacks is to use the vapor deposition polymerization ͑VDP͒ technique. This useful method was first demonstrated by Salem et al 16 and Iijima et al 17 The advantage of this dry process is that many fewer impurities can be expected and also the film thickness can easily be controlled. 13,16,17 Hence, in this letter, we will present a new method for preparing such a single-layer EL polymer thin film.…”

Section: Single-layer Organic Electroluminescent Devices By Vapor Depmentioning

confidence: 93%

“…This useful method was first demonstrated by Salem et al 16 and Iijima et al 17 The advantage of this dry process is that many fewer impurities can be expected and also the film thickness can easily be controlled. 13,16,17 Hence, in this letter, we will present a new method for preparing such a single-layer EL polymer thin film. This has been done successfully by simultaneously co-depositing an EL active molecule, a hole-transporting material, and polymer matrix forming monomers on an indium-tin-oxide ͑ITO͒ glass substrate in a vacuum chamber.…”

Section: Single-layer Organic Electroluminescent Devices By Vapor Depmentioning

confidence: 93%

Single-layer organic electroluminescent devices by vapor deposition polymerization

Wen

Jou

Chiou

et al. 1997

Applied Physics Letters

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A novel method is presented herein regarding the preparation of a single-layer organic electroluminescent (EL) polymer thin film device. The device was made by simultaneously co-depositing two polymer thin film forming monomers, a hole-transporting molecule triphenyldiamine derivative (TPD) and an EL active molecule 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) on an indium-tin-oxide (ITO) glass substrate. The device structure was composed of the ITO glass, the TPD, and TPB co-doped polymer thin film, and a thermally evaporated aluminum electrode. Carrier injection from the two electrodes was significantly observed and the blue light in EL spectra, with an emission maximum at 435 nm, was triggered at a driving voltage of 17 V.

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“…[2] However, in the case of polyimides the formation of charge transfer (CT) complexes is a favorable process in the condensed phase on the substrate due to dipole-dipole interactions of the electron deficient dianhydride and the electron rich diamine. [3,4] VDP was also used to fabricate thin films with intrinsic molecular orientation parallel or perpendicular to the substrate, which can be controlled by the nature of the substrate and the deposition conditions. [5] Generally, molecules orient parallel to the surface at lower and perpendicular at higher substrate temperatures.…”

Section: Introductionmentioning

confidence: 99%

Combinatorial Investigation of the Vapor Deposition Polymerization of Aromatic Polyimides

Bäte

Neuber

Giesa

et al. 2004

Macromol. Rapid Commun.

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Summary: A combinatorial study on the synthesis and in situ orientation of polyimide thin films by vapor deposition polymerization was carried out. The combinatorial libraries consisted of sectors with different thicknesses, compositions, and with or without alignment layers. Monomers were selected to prepare rigid rodlike polyimides and to optimize their orientation during deposition and the imidization process. Vapor deposition of the monomers was performed sequentially or by coevaporation. By using this combinatorial approach the polymerization and the orientation behavior can be simultaneously studied and optimized by variation of film thickness, film composition, and deposition sequence.The combinatorial substrate for sequential evaporation consists of sectors with three PTFE alignment layers (rows B, C, and E) on quartz glass for UV/Vis measurements.magnified imageThe combinatorial substrate for sequential evaporation consists of sectors with three PTFE alignment layers (rows B, C, and E) on quartz glass for UV/Vis measurements.

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Synthesis of aromatic polyamide in vacuum.

Cited by 42 publications

References 0 publications

Temperature dependence of the properties of vapor-deposited polyimide

Temperature dependence of the properties of vapor-deposited polyimide

Single-layer organic electroluminescent devices by vapor deposition polymerization

Combinatorial Investigation of the Vapor Deposition Polymerization of Aromatic Polyimides

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